sound/soc/fsl/imx-spdif.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // Copyright (C) 2013 Freescale Semiconductor, Inc.
   4
   5 #include <linux/module.h>
   6 #include <linux/of_platform.h>
   7 #include <sound/soc.h>
   8
   9 struct imx_spdif_data {
  10         struct snd_soc_dai_link dai;
  11         struct snd_soc_card card;
  12 };
  13
  14 static int imx_spdif_audio_probe(struct platform_device *pdev)
  15 {
  16         struct device_node *spdif_np, *np = pdev->dev.of_node;
  17         struct imx_spdif_data *data;
  18         struct snd_soc_dai_link_component *comp;
  19         int ret = 0;
  20
  21         spdif_np = of_parse_phandle(np, "spdif-controller", 0);
  22         if (!spdif_np) {
  23                 dev_err(&pdev->dev, "failed to find spdif-controller\n");
  24                 ret = -EINVAL;
  25                 goto end;
  26         }
  27
  28         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
  29         comp = devm_kzalloc(&pdev->dev, sizeof(*comp), GFP_KERNEL);
  30         if (!data || !comp) {
  31                 ret = -ENOMEM;
  32                 goto end;
  33         }
  34
  35         /*
  36          * CPU == Platform
  37          * platform is using soc-generic-dmaengine-pcm
  38          */
  39         data->dai.cpus          =
  40         data->dai.platforms     = comp;
  41         data->dai.codecs        = &snd_soc_dummy_dlc;
  42
  43         data->dai.num_cpus      = 1;
  44         data->dai.num_codecs    = 1;
  45         data->dai.num_platforms = 1;
  46
  47         data->dai.name = "S/PDIF PCM";
  48         data->dai.stream_name = "S/PDIF PCM";
  49         data->dai.cpus->of_node = spdif_np;
  50         data->dai.playback_only = true;
  51         data->dai.capture_only = true;
  52
  53         if (of_property_read_bool(np, "spdif-out"))
  54                 data->dai.capture_only = false;
  55
  56         if (of_property_read_bool(np, "spdif-in"))
  57                 data->dai.playback_only = false;
  58
  59         if (data->dai.playback_only && data->dai.capture_only) {
  60                 dev_err(&pdev->dev, "no enabled S/PDIF DAI link\n");
  61                 goto end;
  62         }
  63
  64         data->card.dev = &pdev->dev;
  65         data->card.dai_link = &data->dai;
  66         data->card.num_links = 1;
  67         data->card.owner = THIS_MODULE;
  68
  69         ret = snd_soc_of_parse_card_name(&data->card, "model");
  70         if (ret)
  71                 goto end;
  72
  73         ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
  74         if (ret)
  75                 dev_err_probe(&pdev->dev, ret, "snd_soc_register_card failed\n");
  76
  77 end:
  78         of_node_put(spdif_np);
  79
  80         return ret;
  81 }
  82
  83 static const struct of_device_id imx_spdif_dt_ids[] = {
  84         { .compatible = "fsl,imx-audio-spdif", },
  85         { /* sentinel */ }
  86 };
  87 MODULE_DEVICE_TABLE(of, imx_spdif_dt_ids);
  88
  89 static struct platform_driver imx_spdif_driver = {
  90         .driver = {
  91                 .name = "imx-spdif",
  92                 .pm = &snd_soc_pm_ops,
  93                 .of_match_table = imx_spdif_dt_ids,
  94         },
  95         .probe = imx_spdif_audio_probe,
  96 };
  97
  98 module_platform_driver(imx_spdif_driver);
  99
 100 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 101 MODULE_DESCRIPTION("Freescale i.MX S/PDIF machine driver");
 102 MODULE_LICENSE("GPL v2");
 103 MODULE_ALIAS("platform:imx-spdif");